The .Net frame work is a platform for designing various software, website and operating system. It provides large number of features such as interface, data access, data connectivity, web application and network communication. In this use class library to produce code base application. The .Net frame work is also known as Common Language Runtime (CLR).

C#.net:- It is developed by Anders Hejlsberg. It is object oriented language that includes declarative and functional class based operation. It is simple that contain 80 keywords but it is highly expensive and to implement modern programming concept.

SQL server:-SQL stands for Structured Query Language. It is use to design database of any software. It includes insert, update, delete and modification query. It is sub divided into several languages for example clauses, which are used in statements. Expressions are to produce tables containing rows and columns. Queries which retrieve data from the table. In SQL semicolon is for termination the statement.

Case tool: - Case tool is used to define system behavior that what happens inside and outside the system. It described the flow of event and its action. We use sequence diagram to show the behavior of system. In it collaboration is done in which a team is formed of few members to solve the system errors. In this we use the class to show the system structure, their attributes and their relationship with each other. In class the upper part holds the class name, middle part has the attributes and bottom part has the operation to be undertaken.

Requirement: - It requires a windows xp operating system. C3.net in front end and SQL at the back end, 1GHz processor, 1GB RAM and 120GB hard disc.

Conclusion: – We successfully completed the project with database connectivity. By this software we can check the payment, stock and purchase of the company.